To Next Page

To Previous Page

Environment

Marathon MM Rev. D7 Jul 2017 25

5 Environment

Sensor location depends on the application. Before deciding on a location, you need to be aware of the

ambient temperature of the location, the atmospheric quality of the location, and the possible

electromagnetic interference in that location, according to the sections described above. If you plan to

use air purging, you need to have an air connection available. If you are installing the sensor in a

ThermoJacket accessory, you should use the appropriate mounting device. Also, wiring and conduit

runs must be considered, including computer wiring and connections, if used.

5.1 Ambient Temperature

The sensor is designed for measurements in ambient temperatures between 5°C and 65°C (41 to 149°F).

A water or air cooled housing is available as option to extend the operating range to 120°C (250°F) with

air cooling and to 175°C (350°F) with water cooling.

In ambient conditions up to 315°C (600°F), the ThermoJacket housing should be used. When using the

ThermoJacket, it is strongly recommended to use the supplied air purge to avoid condensation on the

lens.

5.2 Atmospheric Quality

If the lens gets too dirty, it cannot detect enough infrared energy to measure accurately. It is good

practice to always keep the lens clean. The air purge helps keep contaminants from building up on the

lens. If you use the air purge accessory, make sure a filtered air supply with clean dry air at the correct

air pressure is installed before proceeding with the sensor installation.

5.3 Electrical Interference

To minimize measurement errors due to electrical or electromagnetic interference or “noise” be aware

of the following:

 Mount the electronics enclosure as far away as possible from potential sources of electrical

interference such as motorized equipment producing large step load changes.

 Use shielded wire for all input and output connections.

 Make sure the shield wire from the electronics to terminal block cable is earth grounded.

 For additional protection, use conduit for the external connections. Solid conduit is better than

flexible conduit in high noise environments.

 Do not run AC power in the same conduit as the sensor signal wiring.

When installing the sensor, check for any high-intensity discharge lamps or heaters that

may be in the field of view (either background or reflected on a shiny target). Reflected

heat sources can cause a sensor to give erroneous readings.

RayTek MARATHON MM SERIES User Manual

Questions and Answers: